METHOD AND APPARATUS FOR MINIATURIZATION OF MIMO SYSTEMS VIA TIGHTLY COUPLED ANTENNA ARRAY
First Claim
1. A method to generate Multiple Input Multiple Output (MIMO) signals in a wireless propagation channel using antenna array port Orthogonal Modes, the method comprising:
- acquiring an antenna array port scattering matrix S at a first frequency;
calculating, a set of antenna array port orthogonal modes, wherein the set of antenna array port orthogonal modes include antenna array port characteristic modes based on antenna array port scattering matrix S at a first frequency;
ordering the port characteristic modes at a first frequency based on a system performance criteria, the system performance criteria comprising one or more of;
a maximum modal significance parameter α
, a maximum radiation efficiency, a maximum SINR at the user, a minimum interference at the user, and a maximum capacity;
deriving antenna array excitation coefficients at a first frequency from the antenna array port characteristic modes at a first frequency; and
applying the antenna array excitation coefficients as antenna array port excitation weights.
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Abstract
In a Multiple Input Multiple Output (MIMO) system, an apparatus and method includes a Tightly Coupled Array antennas (TCA) or Current Sheet Antennas (CSA). Far-field radiation patterns from any current sheet antenna are formed from the combination of the fields generated by a set of currents on the CSA of array port orthogonal modes, such as the Characteristic Modes (CM). The CM currents are generated by excitation of the CSA element ports with corresponding orthogonal voltages or currents (eigenvectors). Since the radiation patterns of the characteristic modes are orthogonal and uncorrelated, multiple signals may be propagated along the radiation patterns of the characteristic modes, each signal using a different characteristic mode or a different set of characteristic modes. Therefore, a CSA antenna utilizing array port orthogonal modes such as array port characteristic modes can support MIMO communications despite the strong mutual coupling among the antenna elements.
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Citations
21 Claims
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1. A method to generate Multiple Input Multiple Output (MIMO) signals in a wireless propagation channel using antenna array port Orthogonal Modes, the method comprising:
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acquiring an antenna array port scattering matrix S at a first frequency; calculating, a set of antenna array port orthogonal modes, wherein the set of antenna array port orthogonal modes include antenna array port characteristic modes based on antenna array port scattering matrix S at a first frequency; ordering the port characteristic modes at a first frequency based on a system performance criteria, the system performance criteria comprising one or more of;
a maximum modal significance parameter α
, a maximum radiation efficiency, a maximum SINR at the user, a minimum interference at the user, and a maximum capacity;deriving antenna array excitation coefficients at a first frequency from the antenna array port characteristic modes at a first frequency; and applying the antenna array excitation coefficients as antenna array port excitation weights. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus configured to generate Multiple Input Multiple Output (MIMO) signals using antenna array port orthogonal modes, the apparatus comprising:
an antenna array including at least two tightly coupled antennas at a first frequency, wherein each of the at least two tightly coupled antennas includes at least one active port, the active port comprising a terminal connected to at least one of a transmit chain or a receive chain, the at least one of transmit chain or receive chain comprising an assembly including; a baseband unit with a processor and memory, DAC/ADC converters, a frequency mixer, an attenuator, a PA/LNA, a switch, a filter, a matching circuit, a balun configured to enforce excitation and impedance matching at the at least one antenna port. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. An apparatus comprising:
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processing circuitry configured to generate Multiple Input Multiple Output (MIMO) signals in a wireless propagation channel using antenna array port orthogonal modes; an antenna array comprising at least two tightly coupled antennas at a first frequency, a memory configured to store a plurality of instructions, wherein the plurality of instructions are configured to cause the processing circuitry to; acquire an antenna array port scattering matrix S at a first frequency; calculate a set of antenna array port orthogonal modes, wherein the set of antenna array port orthogonal modes include antenna array port characteristics modes, array port Inagaki modes, array port scattering matrix modes, based on antenna array port scattering matrix S at a first frequency; order the antenna array port orthogonal modes at a first frequency based on a system performance criteria, the system performance criteria comprising one or more of;
a maximum modal significance parameter α
, a maximum radiation efficiency, a maximum SINR at the user, a minimum interference at the user, and a maximum capacity;derive antenna array excitation coefficients at a first frequency from the antenna array port orthogonal modes at a first frequency; and apply the antenna array excitation coefficients as antenna array port excitation weights. - View Dependent Claims (17, 18, 19, 20, 21)
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Specification